GRINDERS
Includes: MHG, FPG,
FPG-2, LPG-2, G1, G2, G3,
G9, G9-2 & G9-2T DBC
SERVICE & REPAIR MANUAL
BUNN-O-MATIC CORPORATION
POST OFFICE BOX 3227
SPRINGFIELD, ILLINOIS 62708-3227
PHONE: (217) 529-6601 FAX: (217) 529-6644
To ensure you have the latest revision of the Operating Manual, or to view the Illustrated Parts
Catalog, Programming Manual, or Service Manual, please visit the Bunn-O-Matic website, at
www.bunn.com. This is absolutely FREE, and the quickest way to obtain the latest catalog and
manual updates. For Technical Service, contact Bunn-O-Matic Corporation at 1-800-286-6070.
.0000A 06/09 ©2009 Bunn-O-Matic Corporation
preliminary copy
NOTICE
The Service and Repair manual for the BUNN Grinder family, is currently in progress.
For your convenience, we have provided Electrical Schematic Diagrams on the following pages.
Thank you for your patience.
2
preliminary copy
SCHEMATIC WIRING DIAGRAM
G9-2 DBC, G9-2T DBC W/SMART FUNNEL™
N
W
H
I
B
L
K
L1
LEFT GATE
LIMIT THERMOSTAT
LIMIT THERMOSTAT
SOL
SOL
WHI/ORA
WHI/GRN
WHI/YEL
BLK
WHI
RED/BLK
J1-6
J1-6
J8-3
J8-1
J6-10
J6-5
J6-1
CONTROL PC BOARD
COIL
RELAY
RIGHT GATE
1
11
SHIELD
FUNNEL SENSOR
WHI/GRN
WHI/VIO
SWITCH UNIT ASSY
B2
C4
C5
C6
A2
A1
C3
C2
C1
GRINDER MOTOR
M
WHI
BLK
WHI/BLU
RELAY
CONTACTS
33734.0000G 02/05 © 2001 Bunn-O-Matic Corporation
Switch Unit Assembly Codes
A1 Grind
A2 Stop
B2 Hidden Button "Right"
C1 Large Batch Size "Left"
C2 Medium Batch Size "Left"
C3 Small Batch Size "Left"
C4 Large Batch Size "Right"
C5 Medium Batch Size "Right"
C6 Small Batch Size "Right"
120 OR 230 VOLTS AC
2 WIRE
SINGLE PHASE
50/60 HZ
WIRING DIAGRAMS
3
preliminary copy
SCHEMATIC WIRING DIAGRAM
G9-2 DBC, G9-2T DBC W/SMART FUNNEL™
N
W
H
I
B
L
K
L1
LEFT GATE
LIMIT THERMOSTAT
LIMIT THERMOSTAT
SOL
SOL
WHI/ORA
WHI/GRN
WHI/YEL
BLK
WHI
RED/BLK
J1-6
J1-6
J8-3
J8-1
J6-10
J6-5
J6-1
CONTROL PC BOARD
COIL
RELAY
RIGHT GATE
1
11
SHIELD
FUNNEL SENSOR
WHI/GRN
WHI/VIO
SWITCH UNIT ASSY
B2
C5
A3
A2
A1
C3
C2
GRINDER MOTOR
M
WHI
BLK
WHI/BLU
RELAY
CONTACTS
33734.0003A 02/05 © 2005 Bunn-O-Matic Corporation
120 OR 230 VOLTS AC
2 WIRE
SINGLE PHASE
50/60 HZ
Switch Unit Assembly Codes
A1 On/Off
A2 Grind
A3 Stop
B2 Hidden Button “Right”
C2 Hot Coffee “Full”
C3 Hot Coffee “Half”
C5 Iced Coffee
WIRING DIAGRAMS
4
preliminary copy
SCHEMATIC WIRING DIAGRAM
G9-2TB DBC W/SMART FUNNEL™
N
W
H
I
B
L
K
L1
LEFT GATE
LIMIT THERMOSTAT
LIMIT THERMOSTAT
SOL
SOL
WHI/ORA
WHI/GRN
WHI/YEL
BLK
WHI
RED/BLK
J1-6
J1-6
J8-3
J8-1
J6-10
J6-5
J6-1
CONTROL PC BOARD
COIL
RELAY
RIGHT GATE
1
11
SHIELD
FUNNEL SENSOR
WHI/GRN
WHI/VIO
SWITCH UNIT ASSY
A3
C4
C5
C6
A2
A1
C3
C2
C1
GRINDER MOTOR
M
WHI
BLK
WHI/BLU
RELAY
CONTACTS
33734.0004A 03/05 © 2005 Bunn-O-Matic Corporation
Switch Unit Assembly Codes
A1 Grind
A2 Stop
A3 On/Off
C1 Large Batch Size "Left"
C2 Medium Batch Size "Left"
C3 Small Batch Size "Left"
C4 Large Batch Size "Right"
C5 Medium Batch Size "Right"
C6 Small Batch Size "Right"
100 VOLTS AC
2 WIRE
SINGLE PHASE
50 HZ
WIRING DIAGRAMS
5
preliminary copy
SCHEMATIC WIRING DIAGRAM MHG
N
B
L
K
W
H
I
L1
RIGHT GATE
LEFT HOPPER SENSOR
LIMIT
THERMOSTAT
LIMIT
THERMOSTAT
WHI/YEL WHI/YEL
WHI/GRN
WHI/ORN WHI/ORN
YEL
ORN
YEL
ORN
BLK
WHI WHI
WHI
WHI
J5-5
J5-1
J12-1
J9-10
J9-5
J9-1
CONTROL PC BOARD
DISPLAY BOARD
RELAY
LEFT GATE
RIGHT HOPPER SENSOR
16
1
STATIC SHIELD
SWITCH UNIT ASSY
A2
C5
C6
C4
B2
B1
D3
D2
D1
C3
C2
C1
A1
GRINDER MOTOR
WHI
BLK
WHI/BLU
RELAY
CONTACTS
36399.0000D 08/05 © 2003 Bunn-O-Matic Corporation
100 VOLTS AC,
120 VOLTS AC,
240 VOLTS AC
2 WIRE
SINGLE PHASE
50/60 HZ
Switch Unit Assembly Codes
A1 Grind
A2 Stop
B1 Hidden Button "Left"
B2 Hidden Button "Right"
C1 Large Batch Size "Left"
C2 Medium Batch Size "Left"
C3 Small Batch Size "Left"
C4 Large Batch Size "Right"
C5 Medium Batch Size "Right"
C6 Small Batch Size "Right"
D1 "Digital" Left Hidden Button
D2 "Brewer" Center Hidden Button
D3 "Control" Right Hidden Button
FUNNEL SENSOR
VIO
VIO
J10-4
J10-1
J8-4
J8-1
ORN
YEL
GRN
BLU
SOL
SOL
COIL
M
GRN
GRN
GRN
J16-5
J16-1
MEMORY
BOARD
RED
WHI
GRN
BLK
P1
P2
P3
P4
P1, P2, P3 & P4 ARE
PINS OF A POLARIZED
FOUR-PIN CONNECTOR
WIRING DIAGRAMS
6
preliminary copy
27103.0000D 04/07 ©1996
BUNN-O-MATIC CORPORATION
SCHEMATIC WIRING DIAGRAM
LPG-2E, LPGB-2E
NL1
BLK
RED
WHI
100 VOLTS AC
120 VOLTS AC
2 WIRE
SINGLE PHASE
60 HZ
GRN
3
AMP
2
3
4
5
6
1
7
8
9
10
TIMER ASSY.
(Hopper Slide
Gate Timer
Dial Wiring)
Right - Brown
Left - Orange
YEL
WHI
BLU
YEL
WHI/BLK
BLK
RED
VIO
ORA
OFF/ON/START
SWITCH
RED
RED
RED
GRN
SELECTOR
SWITCH
WHI
RED
RED
WHI
BLK
GRINDER
SLIDE GATES
RT
SOL
LT
SOL
RED RED
M
WIRING DIAGRAMS
7
preliminary copy
WIRING DIAGRAMS
8
preliminary copy
BLK
WHI
RED
RED
10529.0000C 3/92 © 1990
BUNN-O-MATIC CORPORATION
SCHEMATIC WIRING DIAGRAM
LPG & LPG2
NL1
B
L
K
P1
2
3
4
5
6
1
RED
WHI/BLK
BLK
WHI/BLU
WHI/BRN
WHI
GRN
RED
WHI/BLK
BLK
WHI/BLU
WHI/BRN
WHI
BLK
RED
WHI/BRN
WHI/BLU
1
2
3
4
5
P2
BLK
RED
WHI/BRN
WHI/BLU
DC
MOTOR
BLK
WHI
RED
RED
4
1
2
3
P3
GREEN
3
AMP
TIMER
BLK
W
H
I
120 VOLTS AC
2 WIRE
SINGLE PHASE
60 HZ
WIRING DIAGRAMS
9
preliminary copy
BLK
WHI
RED
RED
10529.0002E 8/01 © 1990
BUNN-O-MATIC CORPORATION
SCHEMATIC WIRING DIAGRAM
LPG-A
L2L1
B
L
K
P1
2
3
4
5
6
1
RED
WHI/BLK
BLK
WHI/BLU
WHI/BRN
WHI
GRN
RED
WHI/BLK
BLK
WHI/BLU
WHI/BRN
WHI
BLK
RED
WHI/BRN
WHI/BLU
1
2
3
4
5
P2
BLK
RED
WHI/BRN
WHI/BLU
DC
MOTOR
BLK
WHI
RED
RED
4
1
2
3
P3
GRN/YEL
3
AMP
TIMER
BLK
R
E
D
230 VOLTS AC
2 WIRE
SINGLE PHASE
50/60 HZ
WIRING DIAGRAMS
10
preliminary copy
BLK
WHI
RED
RED
10529.0003E 10/98 © 1998
BUNN-O-MATIC CORPORATION
SCHEMATIC WIRING DIAGRAM
LPG W/Capacitor
L1
P1
2
3
4
5
6
1
1
2
RED
WHI/BLK
BLK
WHI/BLU
WHI/BRN
WHI
GRN
RED
WHI/BLK
BLK
BLK
WHI/BLU
WHI/BRN
WHI
BLK
BLK
BLK
RED
WHI/BRN
WHI/BRN
WHI/BRN
WHI/BLU
1
2
3
4
5
P2
BLK
RED
WHI/BRN
WHI/BLU
DC
MOTOR
BLK
WHI
RED
RED
4
1
2
3
P3
GREEN
TIMER
BLK
BLK
N
W
H
I
120 VOLTS AC 2 WIRE
SINGLE PHASE 60 HZ
P4
+
_
WIRING DIAGRAMS
11
preliminary copy
BLK
WHI
RED
RED
10529.0001D 10/98 © 1990
BUNN-O-MATIC CORPORATION
SCHEMATIC WIRING DIAGRAM
LPG-B
NL1
B
L
K
P1
2
3
4
5
6
1
RED
WHI/BLK
BLK
WHI/BLU
WHI/BRN
WHI
GRN
RED
WHI/BLK
BLK
WHI/BLU
WHI/BRN
WHI
BLK
RED
WHI/BRN
WHI/BLU
1
2
3
4
5
P2
BLK
RED
WHI/BRN
WHI/BLU
DC
MOTOR
BLK
WHI
RED
RED
4
1
2
3
P3
GREEN
3
AMP
TIMER
BLK
W
H
I
100 VOLTS AC
2 WIRE
SINGLE PHASE
50-60 HZ
WIRING DIAGRAMS
12
preliminary copy
WHI/VIO
WHI/VIO
WHI/BLU
WHI/ORA
SCHEMATIC WIRING DIAGRAM G1A, G2A & G3A
GRN/YEL
L1
L2
SW1
BLK
WHI/RED
WHI/RED
SW2
N.O.
N.O.
M
L1
L2
RED (230V)
RED/BLK (240V)
RED (230V)
RED/BLK (240V)
10754.0000E 07/05 © 1993 BUNN-O-MATIC CORPORATION
K-4
K-6
230 VOLTS AC
240 VOLTS AC
2 WIRE
SINGLE PHASE
K
1 or A 0 or B
K-2 or K-7
K-8 or K-9
WHI/VIO
WHI/VIO
WHI/BLU
WHI/ORA
1 or A
GRN
L1
N
SW1
BLK WHI/RED
SW2
K
0 or B
M
L1 L2
120 VOLT AC
2 WIRE
SINGLE PHASE 60 HZ
WHI
WHI
K-2 or K-7
K-8 or K-9
K-6
K-4
SCHEMATIC WIRING DIAGRAM G1, G2 & G3
10190.0000G 07/05 © 1985 BUNN-O-MATIC CORPORATION
WIRING DIAGRAMS
13
preliminary copy
10173-0000F 4/91 © 1987 BUNN-O-MATIC CORPORATION
WHI/GRN
BLK
K1
WHI/BLU
M
L2L1
120 VOLTS AC
2 WIRE
SINGLE PHASE
60 HZ
L1 N
GREEN
K1 N.O.
SCHEMATIC WIRING DIAGRAM G9
TIMER
WHI/RED
WHI/YEL
WHI/ORA
WHI
WHI
WHI/RED
WHI/RED
OPTIONAL KEY SW
54321
W
H
I
/
O
R
A
ORA
URN
CARAFE
WHI/GRN
1
BLK
K1
WHI/BLU
M
L2L1
120 VOLTS AC
2 WIRE
SINGLE PHASE
60 HZ
10215.0000C 4/97 © 1987 BUNN-O-MATIC CORPORATION
L1
N
GREEN
K1 N.O.
SCHEMATIC WIRING DIAGRAM
G9-URN/CARAFE
TIMER
3245
WHI/RED
WHI/YEL
WHI/ORA
WHI
WHI
WHI/RED
WHI/RED
PIN
TAN
MULTI-SET SW
(OPTIONAL)
GRN
YEL
BRN
ORA
GRN
YEL
WIRING DIAGRAMS
14
preliminary copy
10187-0000C 02/08© 1987 BUNN-O-MATIC CORPORATION
WHI/GRN
BLK
K1
WHI/BLU
M
L2L1
230 VOLTS AC
2 WIRE + GND
SINGLE PHASE
50 HZ
L1 L2
GREEN
K1 N.O.
SCHEMATIC WIRING DIAGRAM G9A HD
TIMER
WHI/RED
WHI/RED
WHI/YEL
WHI/ORA
RED/BLK
RED/BLK
RED/BLK
WHI/RED
WHI/RED
54321
OPTIONAL POWER
INDICATOR LIGHT
WIRING DIAGRAMS
15
preliminary copy
4 3
WHI/GRN
1
BLK
WHI/BLU
L2
L1
120 VOLTS AC
2 WIRE
SINGLE PHASE
60 HZ
10388-0000B 12/88 © 1988 BUNN-O-MATIC CORPORATION
L1 N
GREEN
K1 N.O.
SCHEMATIC WIRING DIAGRAM G9
TIMER
3 2 4 5
WHI/RED
WHI/YEL
WHI/ORA
WHI
WHI
WHI/RED
WHI/RED
GRY
1 2
OPTIONAL
MULTI-SET SW
OPTIONAL BREWER
INTERFACE CONNECTOR
PNK
TAN
ORA
PNK
OPTIONAL KEY SW
W
H
I
/
O
R
A
K1
M
120 VOLTS AC
2 WIRE
SINGLE PHASE
60 HZ
4 3
WHI/GRN
1
BLK
WHI/BLU
M
L2 L1
10388-0001C 11/91 © 1991 BUNN-O-MATIC CORPORATION
L1
N
GREEN
K1 N.O.
SCHEMATIC WIRING DIAGRAM G9
TIMER
3 2 4 5
WHI/RED
WHI/YEL
WHI/ORA
WHI
WHI
WHI/RED
WHI/RED
GRY
1 2
OPTIONAL BREWER
INTERFACE CONNECTOR
PNK
TAN
OPTIONAL KEY SW
WHI/ORA
K1
WIRING DIAGRAMS
16
preliminary copy
BLU
VIO
YEL
GRY
TAN
ORA
RED/BLK
WHI
WHI/GRN
WHI/ORA
WHI/YEL
RED/BLK
BLK
WHI/RED
WHI/BLU
M
L2L1
WHI/BLU
WHI/BLK
YEL
230 VOLTS AC
2 WIRE
SINGLE PHASE
50 HZ
10768.0000E 05/03 © 1993 BUNN-O-MATIC CORPORATION
L1 L2
K1 N.O.
SCHEMATICWIRINGDIAGRAMG9-2A HD
OFF/ON/START
SW
HOPPER
SELECTOR SW
TAN
1
8
TIMER
P1 P4
1
8
GRINDER INTERFACE
CONNECTOR
GRY
PNK
4
1
2
3
BLU
BLU
GRN/YEL
OPTIONAL
MULTI-SET SW
BLU
PNK
BLK
GRN
RT
LT
BLK
WHI/RED
K1
SOL
1
RT
SOL
2
LT
SNUBBER
WHI/BLK
WHI/BLK
WIRING DIAGRAMS
17
preliminary copy
WIRING DIAGRAMS
18
preliminary copy
WIRING DIAGRAMS
BLK
WHI
RED
RED
36781.0000A 04/04 ©2004
BUNN-O-MATIC CORPORATION
SCHEMATIC WIRING DIAGRAM
FPG
NL1
RED
WHI/BLK
BLK
WHI/BLU
WHI/BRN
WHI
RED
WHI/BLK
BLK
WHI/BLU
WHI/BRN
WHI
GRN
BLK
SM
MED
LG
RED
WHI/BRN
WHI/BLU
1
2
3
4
5
P2
BLK
RED
WHI/BRN
WHI/BLU
DC
MOTOR
BLK
WHI
RED
RED
4
1
2
3
P3
GREEN
3
AMP
TIMER
SELECT SW.
BLK
120 VOLTS AC
2 WIRE
SINGLE PHASE
60 HZ
White Strip-Tac Plus
Black Ink
Finished Size: 4.5" x 5.0"
?0% Reduction
1
2
3
A
W
H
I
B
L
K
1
2
3
4
5
P2
6
BLK
WHI
RED
RED
36781.0001A 04/04 ©2004
BUNN-O-MATIC CORPORATION
SCHEMATIC WIRING DIAGRAM
FPGA
NL1
RED
WHI/BLK
BLK
WHI/BLU
WHI/BRN
WHI
GRN
BLK
SM
MED
LG
RED
WHI/BRN
WHI/BLU
1
2
3
4
5
P2
BLK
RED
WHI/BRN
WHI/BLU
DC
MOTOR
BLK
WHI
RED
RED
4
1
2
3
P3
GREEN
3
AMP
TIMER
SELECT SW.
BLK
230 VOLTS AC
2 WIRE
SINGLE PHASE
50/60 HZ
1
2
3
A
R
E
D
B
L
K
NOT A PURCHASED SCHEMATIC
FOR REFERENCE ONLY
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2
-
3
-
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-
5
-
6
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7
-
8
-
9
-
10
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11
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12
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13
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17
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18
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